Shí-èr-lǜ (Chinese: 十二律, [ʂɻ̩̌.âɚ lŷ], 12 pitches) (twelve-pitch scale) is a standardized gamut of twelve notes. Also known, rather misleadingly, as the Chinese chromatic scale, it is one kind of chromatic scale used in ancient Chinese music. The Chinese scale uses the same intervals as the Pythagorean scale, based on 2:3 ratios (8:9, 16:27, 64:81, etc.). The gamut or its subsets were used for tuning and are preserved in bells and pipes.
However, "it should not be imagined that this gamut ever functioned as a scale, and it is erroneous to refer to the 'Chinese chromatic scale', as some Western writers have done. The series of twelve notes known as the twelve lü were simply a series of fundamental notes from which scales could be constructed."
The first reference to, "the standardization of bells and pitch," dates back to around 600 BCE while the first description of the generation of the pitches dates back to around 240 CE.
Note names
12 total, which fall within the scope of one octave. (Note that the mathematical method used by the ancient Chinese could never produce a true octave. No matter what is done with numbers involving 1/3, it is impossible to get to 1/2 or to 2.) The next higher frequency in the series of frequencies produced by the Chinese system would be higher than 880 hertz.
See the article by Chen Ying-shi.